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                cerc2008  Suffix reconstruction                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div>
<div>话说练习后缀数组时，小C 刷遍 poj 后缀数组题，</div>
<div>各类字符串题闻之丧胆。就在准备对敌方武将发出连环杀时，对方一记无中生有，又一招顺</div>
<div>手牵羊，小C 程序中的原字符数组就被牵走了。幸运的是，小C 早已经求出了 SA[]，为了</div>
<div>能东山再起，迅速 A 掉此题，他希望各位忠臣们能帮忙求出一组原字符数组的可行方案。已</div>
<div>知原字符数组由小写拉丁字母组成。且小C的SA[]也是有可能求错的， 原数组可能不存在。&nbsp;</div>
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<p></p></p><hr/><h3>输入格式</h3><p><div>输入文件只有一行且为用空格隔开的一个正整数 N。&nbsp;</div>
<div>接下来一行有 N 个数，为 1~N 的排列。&nbsp;</div>
<div>其中对于 100%的数据 N&le;500000</div>
<p></p></p><hr/><h3>输出格式</h3><p><div>一行有 N 个小写拉丁字母，若不存在合法方案输出-1；&nbsp;</div>
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<p></p></p><hr/><h3>样例输入</h3><pre>4              
2 3 4 1 </pre><hr/><h3>样例输出</h3><pre>dabc </pre><hr/><h3>提示</h3><p><p></p>
<p></p></p><hr/><h3>题目来源</h3><p>鸣谢Claris提供SPJ</p>
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